Enable strictFunctionTypes in tsconfig

[davidyuk]

similar to #1706

The most significant problem after enabling this in the project is:

src/tx/builder/schema.ts:583:17 - error TS4109: Type arguments for 'SchemaTypes' circularly reference themselves.

583 type TxSchema = SchemaTypes<typeof txSchema>;
                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/tx/builder/schema.ts:586:13 - error TS2456: Type alias 'TxUnpacked' circularly references itself.

586 export type TxUnpacked = TxSchema['TxUnpacked'];
                ~~~~~~~~~~

It is important to be compatible with this option because it is enabled by default in some environments, like VS code and ts-node. Currently, it breaks the sdk types in a way

        Object literal may only specify known properties, and 'payload' does not exist in type 'Omit<SpendOptions, "onNode" | "onAccount" | "onCompiler"> & Partial<Omit<SpendOptions, "onAccount"> & { onAccount: OnAccount; }>'.

13     await aeSdk.spend(1, aeSdk.address, { payload: 'ba_test' });

error TS2339: Property 'encodedTx' does not exist on type 'TxUnpacked & { tag: Tag.SignedTx; }'.
  Property 'encodedTx' does not exist on type 'TxUnpackedAccount1 & { tag: Tag.SignedTx; }'.

20   const { tag } = unpackTx(tx, Tag.SignedTx).encodedTx;